Greetings Earthlings! 🙂
This week I’d like to discuss an unusual phenomenon that is experienced by approximately 19% of autists (compared with 4-7% of neurotypicals)- Synesthesia.
So what exactly is it?
Synesthesia is a rare neurological phenomenon where triggering one sense involuntarily stimulates another sense e.g., tasting colours, hearing shapes, perceiving words and numbers as colours etc.

Aoife, why do I feel like you’re starting to make up autistic conditions?
I know, it sounds wild but it’s a real thing! Famous synesthetes include numerous musicians such as Billie Eilish, Stevie Wonder, Brendon Urie, Kanye West, Jimi Hendrix and Charli XCX, artist David Hockney and architect Frank Lloyd Wright.
There are two main types of Synesthesia-sensory and cognitive/conceptual
- Sensory Synesthesia– when one sense triggers another. Examples:
- Auditory-tactile synesthesia– when sounds trigger touch-like sensations such as pain, pressure or temperature changes
- Sound-color synesthesia– where you hear sounds as colours
- Mirror-touch synesthesia– where you physically feel something that you see happen to someone else e.g., you see someone stub their toe and feel pain in your own toe
- Cognitive/Conceptual Synesthesia- when senses get combined with semantic triggers, like numbers, letters, or time units. Examples:
- Day-color synesthesia– where you associate days of the week with a particular colour
- Time-space/spatial sequence synesthesia– where you visualize things in a very specific way, like seeing units of time in 3D shapes or colours e.g., 5+6= yellow
Some synesthetes have one form of synesthesia, while others will experience multiple forms.

In my own experience, I have some tendencies towards synesthesia. I associate some things like bands and people with colours- I always saw Muse as blue, Paramore as fuchsia, one of my colleagues as purple etc. I’ve also been known to describe tastes how something smells and vice versa. As discussed previously, I have an excellent sporadic eidetic memory. During my research for this blog, I’ve discovered that synesthetes also have excellent, vivid memories as their enhanced recall is tied to their heightened sensory perceptions and associations. Perhaps this explains why my memory works the way it does as I’ve always been able to recall very detailed memories by thinking of colours, outfits, smells, tastes, specific dates etc.
But why are neurodivergents more likely to experience synesthesia than neurotypicals?

As with many other co-morbid conditions, it appears that there may be a genetic overlap between the genes that cause autism and the genes that cause synesthesia. Moreover, the hyperconnectivity between different regions of the autistic brain (caused by a lack of synaptic pruning), can cause the heightened sensory sensitivity that leads to this blending of sensory stimuli.
Hope you enjoyed this post dear Earthlings! 🙂
Have a lovely weekend!
Aoife

























